Question

а)(x+1)(x²-x+1)-x(x²-1) при x= -2
б) b(b-1)²-(b-2)(b²+2b+4) при b= 2

Answer 1

(x+1)(x^2-x+1)-формула

X^3+1-x^3+x

X+1

-2+1=-1

b(b^2-2b+1) - (b^3 - 8)

b^3-2b^2+b-b^3+8

-2b^2+b+8

-2 * 4 + 2 + 8 = - 8 +2 + 8 = 2